Question

First create the text file given below. Then complete the main that is given. There are comments to help you. An output is also given

Create this text file: data1.txt

-59 -33 34 0 69 24 -22 58 62 -36 
5 45 -19 -73 62 -5 95 42 

` Create a project and a Main class and copy the Main class and method given below. First declare the array below the comments that tell you to declare it. Then there are 3 methods that you need to uncomment and implement. The descriptions of the methods are where the methods should be written. I suggest you keep the comments in the code, so you can read the directions as you comment.

main method - you are only adding 1 statement to the main method and then uncommenting each method call as you implement it. DO NOT DO ALL METHODS AT ONCE - get one method at a time to work and test it to make sure it is working correctly.

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class Main
{
public static void main(String [] args)
{
Scanner keyboard = new Scanner (System.in);

// declare an array called array that has a size of 50
// this is the ONLY statement you need to add to main;

int numElements;
String fileName;
int lowerBound;
int higherBound;

System.out.print("Enter the file name: ");
fileName = keyboard.next();

// numElements = fillArray(fileName, array);
System.out.println("The file has " + numElements + " values");
// printArray(array, numElements);

System.out.print("Enter the lower bound number: ");
lowerBound = keyboard.nextInt();
System.out.print("Enter the higher bound number: ");
higherBound = keyboard.nextInt();

// printElementsInBoundary(array, numElements, lowerBound, higherBound);

}

// Method: fillArray
// This method has a filename and an array of integers passed into it.
// It then opens the file with the name passed in and tests it to make sure
// it opened correct. (See output to see what happens if the file isn't there)
// The method then puts all of the integers in the file into the array, It
// then closes the file and returns the number of integers that were read into
// the array. You can assume that there will be room in the array.

// Method: printElementsInBoundary
// This method has an array and the number of elements in the array passed into it.
// It also has a lower bound and an upper bound passed into it,
// The method then prints all of the numbers in the array that are between the
// lower bound and upper bound - including both the lower and upper bound. The numbers
// are printed with one space between each number.
// After printing them, it prints a new line.

// Method: printArray
// This method prints the numbers out in columns of width 5 and
// prints 10 per line. After printing all of the numbers, it
// prints a new line.

}

Sample Output

Enter the file name: data1.txt
The file has 18 values
  -59  -33   34    0   69   24  -22   58   62  -36
    5   45  -19  -73   62   -5   95   42
Enter the lower bound number: -20
Enter the higher bound number: 60
34 0 24 58 5 45 -19 -5 42 

Sample Output - if file doesn't exist

Enter the file name: datafile.txt
datafile.txt did not open correctly

Answer 1

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class Main
{
public static void main(String [] args)
{
Scanner keyboard = new Scanner (System.in);

// declare an array called array that has a size of 50
// this is the ONLY statement you need to add to main;
int array[]=new int[50];
int numElements;
String fileName;
int lowerBound;
int higherBound;

System.out.print("Enter the file name: ");
fileName = keyboard.next();

 numElements = fillArray(fileName, array);
System.out.println("The file has " + numElements + " values");
 printArray(array, numElements);

System.out.print("Enter the lower bound number: ");
lowerBound = keyboard.nextInt();
System.out.print("Enter the higher bound number: ");
higherBound = keyboard.nextInt();

 printElementsInBoundary(array, numElements, lowerBound, higherBound);

}

// Method: fillArray
// This method has a filename and an array of integers passed into it.
// It then opens the file with the name passed in and tests it to make sure
// it opened correct. (See output to see what happens if the file isn't there)
// The method then puts all of the integers in the file into the array, It
// then closes the file and returns the number of integers that were read into
// the array. You can assume that there will be room in the array.
public static int fillArray(String fileName,int [] array)
{
    int numElems = 0;
    Scanner sc=null;
    File f = new File(fileName);
    //opening the file
    try {
                sc = new Scanner(f);
        } catch (FileNotFoundException e) {
                System.out.println(fileName+" did not open correctly");
                return -1;
        }
    //reading numbers from file to array
    while(sc.hasNextInt()) {
        array[numElems++]=sc.nextInt();
    }

    // Close the file
    sc.close();
    return numElems;
    // return the number of elements in the array

}

// Method: printElementsInBoundary
// This method has an array and the number of elements in the array passed into it.
// It also has a lower bound and an upper bound passed into it,
// The method then prints all of the numbers in the array that are between the
// lower bound and upper bound - including both the lower and upper bound. The numbers
// are printed with one space between each number.
// After printing them, it prints a new line.

private static void printElementsInBoundary(int[] aArray, int aNumElements, int aLowerBound, int aHigherBound) {
        for(int i=0;i<aNumElements;i++) {
                if(aArray[i]>=aLowerBound && aArray[i]<=aHigherBound)
                        System.out.print(aArray[i]+" ");
        }
}

// Method: printArray
// This method prints the numbers out in columns of width 5 and
// prints 10 per line. After printing all of the numbers, it
// prints a new line.
private static void printArray(int[] aArray, int aNumElements) {
        for(int i=0;i<aNumElements;i++) {
                if(i%10==0 && i!=0)
                        System.out.println();
                System.out.printf("%5d",aArray[i]);
        }
        System.out.println();
}


}

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